Method and apparatus for implementing trunk optical fiber rapid protection switching of EPON system

Abstract

The invention discloses a method for quickly protecting and replacing a main optical fibre in an EPON system. During normal operation, only a main optical module is enabled in an OLT down direction, and a spare optical module is turned off so as to ensure that only one optical signal travels on the downward optical path; the optical signal emitted by the ONU is transmitted to two optical modules through two main optical fibers in an up direction, and the signals received by the main optical module is transmitted to a PON chip; once the main optical fiber breaks down during working, the CPLD judges whether the main optical module is switched into the spare optical module or not according to the SD signal output by the main optical module during working; and besides, the invention also discloses a device for quickly protecting and replacing the main optical fiber in the EPON system. The invention adopts the hardware logic to perform the operations of detection, judgment and replacement control to replacement conditions, avoids the problem of long switching time during CPU software processing and effectively guarantees the quick business recovery under the condition that the main optical fiber breaks down.

Description

technical field [0001] The invention relates to a method and a device for rapid protection switching of backbone optical fibers in an EPON system. Background technique [0002] Ethernet Passive Optical System (EPON) is a new type of optical fiber access network technology. It adopts a point-to-multipoint structure and passive optical fiber transmission to provide various services on the Ethernet. It adopts PON technology in the physical layer, uses Ethernet protocol in the link layer, and realizes the access of Ethernet by using the topological structure of PON. Therefore, it combines the advantages of PON technology and Ethernet technology: low cost; high bandwidth; strong scalability, flexible and fast service reorganization; compatible with existing Ethernet; convenient management, etc. [0003] In recent years, the user scale of the access network has continued to expand, and the demand for network bandwidth has also increased. As a new generation of broadband access te...

AI Technical Summary

Problems solved by technology

At present, the protection of the backbone optical fiber of the EPON system is mainly to adopt concurrent selective reception on the OLT side, and the onboard CPU software on the OLT performs switching control according to the switching conditions such as the registration of all ONUs on the OLT. Although this method can be realized The function of protection switching, but due to the need for software intervention, there are still disadvantages such as the switching time is generally relatively long, and the switching control cannot be performed when the onboard CPU fails.

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